Perhaps you should try some spelling variations:
"international ecological economics series" » "international technological economics series", "international psychological economics series", "international economics economics series"
"international political economic series" » "international policy economic series", "international political economy series", "international political economic services", "international political economic theories"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("international political economic series") OR ("international ecological economics series"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"international political economic series\") OR (\"international ecological economics series\"))".
• Removing quotes may allow a broader search: (( international political economic series ) OR ( international ecological economics series )).
• Adding a wildcard symbol may retrieve word variants: (("international political economic series") OR ("international ecological economics series"))*.